Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3f953f93d79465…

MALICIOUS

PDF

99.8 KB Created: 2021-06-27 09:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e175808a01fab9149e7d52c256d5ec42 SHA-1: eb60b8d3c85688b4ed75ead6b556bb207172b5c6 SHA-256: fb3f953f93d7946551c3d3f873b4a83913d00dbaad024a387b89e6a3d0424886
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous links pointing to potentially compromised WordPress sites and disposable hosting indicates a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d5b345c001158766aba85fa717710666/71135948516.pdf
    • http://akinmedikal.com/uploads/file/80932677719.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a08fb90ad70---33216993074.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607936210d27e---rijaxagubimogurovipelexob.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b7ac58b277f4a59e48509679130c5d90/58471565125.pdf
    • https://baongochoa.com/upload/file/40932843113.pdf
    • http://terralis.eu/catalogue_dynamique/file/98095182347.pdf
    • http://architects-desk.com/uploadsfile/48379550037.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/131342ccbe4fcdea66b573600c2bc85a/mobugofatej.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a24dcdd82---93568003863.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/n72uefpbfh5m7ts7ad486ttm3s/71849950152.pdf
    • http://mashtalkandil.com/userfiles/file/famufuwavomi.pdf
    • http://northmarking.com/userfiles/files/feretilobowaduketun.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be33c4c068d---lunetoletifumupafigudu.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/l122ljonjng58h0qp2fg8ifjrk/wetuxexozarovik.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/xoxepezejireli.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076010ef1744---gemevararal.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1151b4346b7c9388c72a1e05304dd527/92882501097.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076942a09b33---tusemuxejifaduwel.pdf
    • https://edusfera.pl/upload/file/gududadopudipebaverewaf.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/i207dbbhsui9d13vonrn27hp64/jimobegifupatogefugej.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160788dee55386---gemukugalus.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607df32219286---45428931904.pdf
    • http://10glazsikeyrosa.ru/file/43769984049.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ee802b4342f1b4a1ccdbdf7ee50dc670/ximad.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hadith+about+equality
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013a73.bin
afe87a500b82779b98d2b679174712fa03a57e25d2725cc6c8c048033de7b5a1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13A73 25892 bytes
font_00_sfnt_off0000f81c.bin
f3c42c9e2ed8f2668d81dc5540c4d1ddd3dccfb7e2bc32656fcb43d1e27e9cdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 10464 bytes
font_01_sfnt_off00010faa.bin
43978ded8283d8d5ca55fdf98795683ea778809d99c1326ed7785bafe791242f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 16524 bytes
font_03_sfnt_off0001694f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1694F 16792 bytes

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